65-2424RK Hydrogen Sulfide Transmitter Operator’s Manual Part Number: 71-0062RK Revision: A Released: 2/16/11 www.rkiinstruments.
WARNING Read and understand this instruction manual before operating detector. Improper use of the detector could result in bodily harm or death. Periodic calibration and maintenance of the detector is essential for proper operation and correct readings. Please calibrate and maintain this detector regularly! Frequency of calibration depends upon the type of use you have and the sensor types.
Product Warranty RKI Instruments, Inc. warranties gas alarm equipment sold by us to be free from defects in materials, workmanship, and performance for a period of one year from date of shipment from RKI Instruments, Inc. Any parts found defective within that period will be repaired or replaced, at our option, free of charge.
Table of Contents Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 H2S Sensor . . . . . . . . . . . . . . . . . . . . . . . .
Overview This manual describes the 65-2424RK hydrogen sulfide (H2S) transmitter. This manual also describes how to install, start up, maintain, and calibrate the transmitter. A parts list at the end of this manual lists replacement parts and accessories for the H2S transmitter. Specifications Table 1 lists specifications for the H2S transmitter.
Description This section describes the components of the H2S transmitter. The transmitter consists of the H2S sensor, sealing spacer, amplifier printed circuit board (PCB), and enclosure.
Interconnect Terminal Strip The interconnect terminal strip is the four-point terminal strip on the lower left side of the amplifier PCB. Use the interconnect terminal strip to connect the transmitter to a controller. Sensor Sockets There are four sensor sockets located in a circular pattern near the top of the amplifier PCB. The sensor plugs into these sockets. Span Pot The span pot is near the bottom right corner of the amplifier PCB.
Installation This section describes procedures to mount the H2S transmitter in the monitoring environment and wire the transmitter to a gas monitoring controller. Mounting the H2S Transmitter 1. Select a mounting site that is representative of the monitoring environment. Consider the following when you select the mounting site. • Select a site where the transmitter is not likely to be bumped or disturbed. Make sure there is sufficient room to perform start-up, maintenance, and calibration procedures.
Wiring the H2S Transmitter to a Controller WARNING: Always verify that the power source is off before you make wiring connections. 1. Turn off the controller. 2. Turn off or unplug incoming power at the power source end. 3. Remove the enclosure’s cover by unscrewing the four cover screws, one at each corner. 4. Guide a two-conductor, shielded cable through the cable bushing at the bottom of the enclosure. 5. Connect the two wires to the interconnect terminal strip as follows (see Figure 3).
9. If shielded cable is used, connect the cable’s drain wire to an available chassis (earth) ground at the controller. RKI controllers typically have a ground stud that can be used to ground the cable’s drain wire. Start Up This section describes procedures to start up the H2S transmitter and place the transmitter into normal operation. Introducing Incoming Power 1. Complete the installation procedures described earlier in this manual. 2.
reading is 100 mV (±2 mV). 11. Turn the regulator on/off knob clockwise to close it. 12. Remove the calibration cup from the sensor face. 13. Unscrew the regulator from the zero air calibration cylinder. For convenience, leave the sample tubing connected to the regulator and the calibration cup. 14. Store the components of the calibration kit in a safe and convenient place. 15. Remove the voltmeter leads from the test points. 16. Secure the cover to the enclosure.
7. Use the following formula to determine the correct test points output for the test sample. Output (mV) = (calibrating sample/fullscale) X 400 + 100 For example, with a test sample of 25 PPM H2S and a fullscale setting of 100 PPM, the correct output is 200 mV. 200 (mV) = (25/100) X 400 +100 Performing the response test 1. Turn the regulator on/off knob counterclockwise to open it. The sample will begin to flow. 2. Hold the calibration cup against the H2S sensor’s face.
Recommended action • Verify that the transmitter wiring is correct and secure. • Calibrate the transmitter. • If the fail condition continues, replace the H2S sensor. • If the fail condition continues, contact RKI for further instruction. Slow or No Response/Difficult or Unable to Calibrate Symptoms • The transmitter responds slowly or does not respond during the monthly response test. • Unable to accurately set the zero or response reading during the calibration procedure.
7. Secure the cover to the enclosure. 8. Turn on or plug in incoming power at the power source end. 9. Turn on the controller. CAUTION: Allow the replacement sensor to warm up for 5 minutes before you continue with the next step. 10. Calibrate the replacement sensor as described in the Calibration section of this manual. Replacing the Amplifier PCB 1. Turn off the controller. 2. Turn off or unplug incoming power at the power source end. 3.
. Calibrate the H2S transmitter as described in the Calibration section of this insert. Calibration Frequency Although there is no particular calibration frequency that is correct for all applications, a calibration frequency of every 3 to 6 months is adequate for most H2S transmitter applications. Unless experience in a particular application dictates otherwise, RKI Instruments, Inc. recommends a calibration frequency of every 3 months.
Setting the Zero Reading NOTE If you can verify that the H2S transmitter is in a fresh air environment, you do not need to apply zero air to the detector before adjusting the zero reading. 1. Turn the regulator on/off knob counterclockwise to open it. 2. Hold the calibration cup against the H2S sensor’s face. Leave the rubber boot and sealing spacer on the sensor when calibrating. Hold the cup on gently to allow gas to escape and avoid pressurizing the sensor’s sensing face. 3.
5. Store the components of the calibration kit in a safe and convenient place. Parts List Table 6 lists replacement parts and accessories for the H2S channel.
